Sawmill.



No. 732,649. PATENTED JUNE 30, 1903. H. S. MITCHELL.

SAWMILL.

APPLICATION FILED APR. 13, 1903.

N0 MODEL. 7 I L 2 SHEETS-SHEET 1.

rm: Moms Pncns cn. PHnfo-u'mu, WASNINGTON, n. c.

PATENTED JUNE .30, 1903.

H. s. MITCHELL.

SAWMILL APPLICATION I'ILED APR. 1a, 1903.

2 SHEETS-SHEET 2.

N0 MODEL.

I WMYMu,

ma Nonms PETERS co. Pnorauwo. WASHINGTON, u c.

UNITED STATES iatented June 30, 1903.

PATENT OFFICE.

SAWMILL.

SPECIFICATION forming part of Letters Iatent No. 732,649, dated June 30,1903.

Application filed April 13 1903.

To all whom it may concern:

Be it known that I, HENRY S. MITCHELL, a citizen of the United States,residing at. Seattle, in the county of King and State of Washington,have invented certain new and useful Improvements in Sawmills, of whichthe following is a specification.

My present invention pertains to improvements in sawmills, theconstruction and advantages of which will be hereinafter set forth,reference being had to the annexed end elevation of the log-deck, thelive rollway, and a portion of the carriage; Fig. 3, a verticalsectional view on the line 1 1 of Fig. 1; Figs. 4 and 5, detail views ofthe bridge arms or members, and Fig. 6 a detail view of the bolt carriedby the arm.

The object of the invention is to provide a simple and efficient meansfor bridging the space above the live 'rollway or lumber-conveyer, whichoccupies a position between the log deck or skid and the carriage, thearrangement under the present construction being such that thebridge-pieces which are moved into place by the log or cantautomatically assume their normal position after the log or cant isremoved therefrom and leave the rolls entirely free for the reception ofa slab or board. Suitable means will be provided for preventing thebridge-pieces from passing below a predetermined plane at their outerend, or, in other words, they will be held in approximate alinement withthe carriage when depressed by a log.

I am aware that devices for bridging over the live rollway have beenemployed heretofore, but in all of them, so far as I know, positivelyoperated bridge-pieces, connected in one or another way to someoperativeportion of the sawmill, have been used. With my invention suchconnections are unnecessary."

Referring to thedrawings, A designates the carriage, and B the liverolls placed intermediate the carriage and the log deck or skid C, whichin the present instance is shown as composed of a series of properly-Serial No. 152,417. (No model.)

i supported timbers D, over which a suitable flooring is laid.

It is to be understood that any form of lumber-conveyer may be employedand that the deck or skidway may be constructed in any approved mannerso-long as it comes into approximately the same plane as the carriageupon which the logs or cants are to be placed. I

Any suitable mechanism for advancing the logs upon the deck or skidwaymaybe used.

emery transfer. This comprises a block E, movable upon tracks or ways F.Said block carries a pivoted arm G, which normally stands as indicatedin Fig. 2, with its nose in position to engage and push a log forward.

Block E is fastened to a chain H, to which causing said block to movebackward and forward alternatelygand arm G first to move backward underthe log or cant, and then after having risen in rear thereof to engagethe same and advance it along the deck toward the carriage. Two or moreof these devices will be employed, according to the work to be done.

A number of arms or bride-pieces I are pivotally mounted in the skidwayat its edge adjacent to the lumber-conveyer' and preferably intermediatethe forward ends of timbers D. These arms or bridge-pieces are of suchlength that they reach approximately to the carriage when they aredepressed bya piece of timber. (See Figs. 2 and 3.)

A bolt J is pivotally connected to the rear end of each bridge-piece,and a large washer or disk K-is mounted on the lower end of said bolt,being held securely in place by suitable nuts. Bolt J is of such lengththat when the arms or bridge-pieces are depressed approxithe washerswill come against the under face of timbersD ,thereby forming, ineffect,a stop and preventing further depression of the outer ends of thebridge-pieces which then overlie the live rollway. As soon as the log orcant isremoved from the pieces I onto the carriage said pieces willswing into practically a vertical position, owing to the preponmotion isimparted through suitable means,

In Figs. 1 and 2 there is shown the so-called mately to the level of thedeck and carriage derance of weight being in rear of the fulcrum orpivot of the bridge-pieces. It will thus be seen that the action of thebridgepieces in moving to the bridging position as the log advancesalong the deck or skidway and comes into contact therewith, in remainingin such position over the lumber-conveyer until the log is positionedupon the carriage, and in immediately assuming their normal or uprightpositions and leaving the lumber-conveyer unobstructed is entirelyautomatic.

It is manifest that all of the arms or pieces I may be mounted upon acommon shaft and whether such construction or a single pivot or fulcrumbe employed is immaterial. So, too, stop devices other than that abovespecifically pointed out may be employed for limiting the descent of thearms.

Having thus described my invention, what I claim is 1. In combinationwith a sawmill-carriage, a log deck orskidway; alumber-conveyerintermediate said carriage and deck; and ase ries of arms pivoted to thedeck adjacent to the lumber-conveyer, said arms normally occupying asubstantially upright position and capable of being swung down over thelumber-con veyer by a log 01' cant advanced along the skidway.

2. In combination with a sawmill-carriage, a log deck or skidway; alumber-conveyer intermediate said carriage and skidway; a series ofpivoted arms carried by the skidway, said arms normally occupying anupright position, but capable of being swung down over thelumber-conveyer by an advancing log or cant; and means to limit thedownward movement of said arms when a log or cant is resting thereon.

In combination with a sawmill-carriage, a log deck or skidway; alumber-conveyor intermediate said carriage and skidway; a series of armspivot-ally mounted adjacent to the conveyer, said arms being arrangedand adapted to swing down over the conveyer; and means foradvancing alog or cant along the deck, bringing it into contact with the arms andthereby depressing them, whereby a bridge for the log or cant isautomatically formed over the conveyer.

4. In combination with a sawmill-carriage, a log deck or skidway; alumber-conveyer intermediate said carriageandtheskidway; and a series offree arms pivoted upon said skidway, the pivotal point of said armsbeing such that their outer ends normally will rise clear of thelumber-conveyer and stand in the path ofa log or cant advancing on theskidway.

5. In combination with a sawmill-carriage, a log deck or skidway; alumber-conveyer intermediate said carriage and skidway; a series of freearms pivoted to the skidway adjacent to the ln mber-con veyer, said armsprojecting above the surface of the skidway in the path of travel of anadvancing log or cant; and means for limiting the extent of depressionof said arms.

6. In combination with a sawmill-carriage, a log deck or skidway; a liverollway intermediate said parts; a series of arms pivoted intermediatethe outer ends of the timbers of the way, one portion of each of saidarms standing above the deck in the path of an advancing log or cant;means for advancing logs or cants along said deck; a bolt pivoted to theinner end ofeach arm; and a washer carried by said bolt, said washermaking contact with the under face of the timbers when the arms aredepressed and acting as a stop therefor, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY S. MITCHELL.

Witnesses:

H. B. HUNTLEY, JOHN B. SHoULT.

